Milling-tool.



. N0. 67.9,l43. Patented-July 23, I90I.

w. H. FORD. MILLING'TOOLQ (Application flied Oct. 19, 1900. (No Model.)

War/Z2770 Z 0 7" W UNTTED STATES PATENT EETEE.

WILLIAM H. FORD, OF LOYVELL, MASSACHUSETTS, ASSIGNOR TO RINGSET COMPANY,OF BOSTON, MASSACHUSETTS.

MILLING-TOOL.

SPEGKFIGATION forming part of Letters Patent No. 679,143, dated July 23,190 1. Application filed october 19, 1900. Serial No. 33,647. (Nomodel.)

To CLZZ whom itmay concern:

Be it known that I, WILLIAM H. FORD, a citizen of the UnitedStates,residing atLowell, in the county of Essex and State of. Massa- 5chusetts, have invented an Improvement in Milling-Tools, of which thefollowing description, in connection with the accompanying drawings, isa specification, like characters on the drawings representing likeparts.

In the production of finger-rings and jewelry adapted to displaydiamonds or other stones seats have to be cut to receive and retain thestone. Usually the ring or other article in which the stone is to bedisplayed presents a series of prongs the inner sides 'of which must becut or notched to receive and hold the stone to be used.

The tool herein to be described has been devised to cut the seats forstones.

The tool shown presents an arc-shaped cutter and a burnisher or uide,said parts being movable away one from the other to adapt it to cut theseat of the required diameter and burnish the same.

Figure 1 in elevation shows a tool embody-- ing my invention. Fig. 2shows the parts of the active end of' the tool detached from the handleand separated. Fig. 3 is an enlarged detail of the cutting member orfile part of 0 the tool. Fig.4 is a partial longitudinal section of thetool, and Fig. 5 shows part of a ring in section with a seat cuttherein.

My novel tool is represented as composed of a plurality of parts, one ofwhich, as a, is 3 5 provided with suitable teeth to be described,

by which to cut away the metal in the formation of a seat for the stone,the other part b, by acting against the inner sides of the prongs,burnishing the same after the action 0 of the cutter a. The cuttermember a, as

shown, is provided with a plurality of cutting-faces 1, 2, 3, and 4,occupying arcs of circles of different diameters, to thereby adapt thetool to out the side walls of the stone-seats 5 and adapt them to thediameter of the stone to be set. Each face 1, 2, 3, and 4 is terminatedby a toothed end or portion, as 5 6 7, which is adapted to out or formthe bottom of the seat.

Fig. 5 shows in section part of a ring having a cnt'seat for a stone.The side walls 8 of the seat are cut by one or the other face 2, 3, or4, while the bottom 9 is cut by one of the ends 5, 6, or 7. Each cutterhas a flange,

as 10, extended from it, which acts as a stop to determine the depth ofthe cut in the side walls, said flanges contacting with the tops of theprongs when the cutter should cease to act. The member 1) is shown as ofthe same shape as the member a, and the smooth faces 12, 13, 14, and 14acting against the interior of the cavity in which the seat is being cutby the member a, burnishes the cut surface.

To enable the tool to be expanded for and while cutting the seat orseats, I have provided one member, as I), with an adjusting device c,shown as a screw having amilled head, and preferably the same member hasa guiding device d, shown as a pin enteringloosely a hole in the membera. Each member a and b has a hole in its end, (see Fig. 4,) in which isentered a yielding support 15 or 16, shown as pins sustained by a handlee, and each member is shown as provided with a projection, as 18 19, toenter guideways cut in the handle.

The tool is entered into the space or between the prongs to be providedwith the seat,

the inner side of each prong presenting a thin straight edge, and thetool will then be turned to insure the proper pressure of thecutting-faces on the material to be cut, and thereafter the tool may berotated back and forth until the seats have been out and burnished tothe proper depth.

This invention is not limited to making the tool of the exact shapeshown, as I believe I am the first to make an expansible tool of theclass described or to make a tool adapted to cut seats of differentdiameters.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s

1. A milling-tool composed of mnltiparts, 5 one having a convenedcutting edge, and the other a burnishing-surface.

2. A milling-tool composed of multiparts, one part acting to cut metal,and the other to burnish the out portion, and means to move roe one ofsaid parts laterally away from the other. 3. A milling-tool composed ofmultiparts,

one of said parts having a plurality of convexed cutting edges and theother having a plurality of burnishing-surfaces.

4.. A milling-tool having an edge to make a circular cut, an end to cuta seat or shoulder to meet the circular cut, and a burnishingsurface toburnish the out parts.

5. A milling-tool having an arc-shaped cutting edge provided with aseries of file-like teeth to make a circular cut, and a face extendedtherefrom to limit the extent of the cut made by said edge.

provide for placing the said parts at the de- I sired distance apartaccording to the size of the holes to be provided with seats or notches.

7. A milling device segmental in cross-section and presenting anarc-shaped cutting edge, a stop to determine the depth of cut madebysaid edge, the entering end of the arc-shaped cutting edge havingteeth to determine the shape of the cut at its inner end.

8. A milling device presenting a series of cutting edges, arc-shaped incross-section, each cutting edge having extended from it a flange to actas a stop to determine the extent of the cut made by the edge from whichit projects.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM H. FORD.

Witnesses:

GEO. W. GREGORY, EDITH M. STODDARD.

